001package org.hl7.fhir.utilities;
002
003import java.util.List;
004
005/*
006  Copyright (c) 2011+, HL7, Inc.
007  All rights reserved.
008  
009  Redistribution and use in source and binary forms, with or without modification, 
010  are permitted provided that the following conditions are met:
011    
012   * Redistributions of source code must retain the above copyright notice, this 
013     list of conditions and the following disclaimer.
014   * Redistributions in binary form must reproduce the above copyright notice, 
015     this list of conditions and the following disclaimer in the documentation 
016     and/or other materials provided with the distribution.
017   * Neither the name of HL7 nor the names of its contributors may be used to 
018     endorse or promote products derived from this software without specific 
019     prior written permission.
020  
021  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
022  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
023  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
024  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
025  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
026  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
027  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
028  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
029  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
030  POSSIBILITY OF SUCH DAMAGE.
031  
032 */
033
034
035
036/**
037 * Encapsulates StringBuilder to build strings of values separated by comma
038 * @author Ewout
039 */
040
041public class CommaSeparatedStringBuilder {
042
043  boolean first = true;
044  String sep = ", ";
045  StringBuilder b = new StringBuilder();
046  int count = 0;
047  String pending = null;
048  private String lastSep;
049
050  public CommaSeparatedStringBuilder() {
051    this.sep = ", ";
052    this.lastSep = ", ";
053  }
054  
055  public CommaSeparatedStringBuilder(String sep) {
056    this.sep = sep;
057    this.lastSep = sep;
058  }
059
060  public CommaSeparatedStringBuilder(String sep, String lastSep) {
061    this.sep = sep;
062    this.lastSep = lastSep;
063  }
064
065  private void commit(boolean last) {
066    if (pending != null) {
067      if (!first) {
068        if (last) {
069          b.append(lastSep);
070        } else {
071          b.append(sep);
072        }
073      }
074      b.append(pending);
075      first = false;  
076    }
077  }
078  public void append(String value) {
079    commit(false);
080    pending = value;
081    count++;    
082  }
083  
084  public int length() {
085    commit(false);
086    return b.length();
087  }
088  
089  public int count() {
090    return count;
091  }
092
093  @Override
094  public String toString() {
095    commit(true);
096    return b.toString();
097  }
098
099  public void appendIfNotNull(String s) {
100   if (!Utilities.noString(s))
101     append(s);
102    
103  }
104
105  public void addAll(List<String> list) {
106    for (String s : list) {
107      appendIfNotNull(s);
108    }
109    
110  }
111
112  public static String join(String sep, List<String> list) {
113    CommaSeparatedStringBuilder b = new CommaSeparatedStringBuilder(sep);
114    for (String s : list) {
115      b.append(s);
116    }
117    return b.toString();
118  }
119}